Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi all! We have been experiencing an issue on site where threads have been missing the latest postings. The platform host Vanilla are working on this issue. A workaround that has been used by some is to navigate back from 1 to 10+ pages to re-sync the thread and this will then show the latest posts. Thanks, Mike.
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Winter/Spring 2013 (Model Output Discussion)

1404143454675

Comments

  • Closed Accounts Posts: 309 ✭✭Wolfe_IRE


    DanRu wrote: »
    Excellent run from the GFS 6Z :D

    Not really. It has us in a cool W, occasionally NW, flow with rain or heavy showers (some of which will be wintry on high ground). It is in a word 'horrible' if you are looking for signs of cold weather reappearing in the near future. It is cool zonal all the way into mid December.

    While cold is becoming more entrenched over northern Europe, the building blocks are just not in place to put Ireland under a NE/E setup during the coming 7-10 days.


  • Registered Users Posts: 32 DanRu


    True, I was just looking at the cold building over N Europe. I never seen Ireland getting any large falls of knickers out of a Northerly flow , waiting for the beast from the East!


  • Registered Users Posts: 31 Jostef


    Wolfe_IRE wrote: »
    Not really. It has us in a cool W, occasionally NW, flow with rain or heavy showers (some of which will be wintry on high ground). It is in a word 'horrible' if you are looking for signs of cold weather reappearing in the near future. It is cool zonal all the way into mid December.

    While cold is becoming more entrenched over northern Europe, the building blocks are just not in place to put Ireland under a NE/E setup during the coming 7-10 days.

    Just curious Wolfe....how can you say with any certainty that it will be cool zonal all the way into mid December when it has been said time and time again that the models are only accurate up to 96 hours? We're still in November afterall. Surely FI must apply to rubbish weather as well as the good snowy variety.


  • Closed Accounts Posts: 309 ✭✭Wolfe_IRE


    It looks that way on all computer models, Jostef. You are correct about FI but the chances of a reversal to severe cold in the next 7-10 days from what is being shown now is unlikely. Usually when someone shows a chart from FI, they show one chart from one model. All charts from all models are presently showing a cool zonal setup. There will be 12-24hr blasts of cold weather in between but there is no sign of any extended cold in the next 7-10 days


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Jostef wrote: »
    Just curious Wolfe....how can you say with any certainty that it will be cool zonal all the way into mid December when it has been said time and time again that the models are only accurate up to 96 hours? We're still in November afterall. Surely FI must apply to rubbish weather as well as the good snowy variety.

    I think he is just commenting on what the GFS run shows.


  • Advertisement
  • Closed Accounts Posts: 2,693 ✭✭✭Redsunset


    well I wouldn't call the flow zonal.

    Meridional flow around the Northern hemisphere looks evident with some exaggerated troughs and ridges.


  • Banned (with Prison Access) Posts: 25,234 ✭✭✭✭Sponge Bob


    NAO in positive mode is not conducive to a block on the atlantic flows and does not look like building a block over the next 7-10 days. So I entirely agree with Wolfie on that timescale. Normal service for 7-10 days.

    We also see a more positive than was forecast signal meaning that the models are underestimating the positivity in the positivity over the last 48 hours or so. See the 7 day forecast/outturn divergence. :)

    nao.sprd2.gif


  • Closed Accounts Posts: 309 ✭✭Wolfe_IRE


    No, I'm not Maq. Why do you presume that?

    For what it's worth, The GFS is a horrid run Maq
    http://modeles.meteociel.fr/modeles/gens/graphe_ens3.php?x=250&ext=1&y=40&run=6&runpara=0

    Other models. None GFS.

    ECM, JMA, GEM, UKMO

    J192-21_jvl4.GIF
    UW96-21_qlq4.GIF
    gem-0-240_her5.png
    ECM0-240_tmp5.GIF


  • Registered Users Posts: 31 Jostef


    Wolfe_IRE wrote: »
    It looks that way on all computer models, Jostef. You are correct about FI but the chances of a reversal to severe cold in the next 7-10 days from what is being shown now is unlikely. Usually when someone shows a chart from FI, they show one chart from one model. All charts from all models are presently showing a cool zonal setup. There will be 12-24hr blasts of cold weather in between but there is no sign of any extended cold in the next 7-10 days

    I hear what you're saying, but the GFS, ECMF and UKMO runs from a week or so ago were all in full agreement on some tastey blocking for our current time frame......but unfortunately we got bupkis! So bearing this in mind, is it even slightly possible that the crud that's showing on the models at the moment could flip in the happy direction within the next couple of weeks?


  • Banned (with Prison Access) Posts: 25,234 ✭✭✭✭Sponge Bob


    Jostef wrote: »
    but unfortunately we got bupkis!
    Mmmm Bupkis, tashty!
    So bearing this in mind, is it even slightly possible that the crud that's showing on the models at the moment could flip in the happy direction within the next couple of weeks?
    Look at the NAO outturn....are the models a modelling ????


  • Advertisement
  • Closed Accounts Posts: 309 ✭✭Wolfe_IRE


    Jostef wrote: »
    I hear what you're saying, but the GFS, ECMF and UKMO runs from a week or so ago were all in full agreement on some tastey blocking for our current time frame......but unfortunately we got bupkis! So bearing this in mind, is it even slightly possible that the crud that's showing on the models at the moment could flip in the happy direction within the next couple of weeks?
    I only recall the GFS consistently giving us a strong easterly/northeasterly feed. The others hinted at it but did not show the blocking to be as effective as what was shown on the GFS. The odds were stacked in favour of a relatively short cold spell as a result.


  • Closed Accounts Posts: 309 ✭✭Wolfe_IRE


    Redsunset wrote: »
    well I wouldn't call the flow zonal.

    Meridional flow around the Northern hemisphere looks evident with some exaggerated troughs and ridges.

    Meridional flow is south to north or north to south. this is pretty much nw to se or w to e, and therefore i would categorise it as cool zonal. Very similar to last winter.


  • Closed Accounts Posts: 2,693 ✭✭✭Redsunset


    I understand that but I'm taking the Northern hemisphere as a whole.


  • Closed Accounts Posts: 5,150 ✭✭✭Deep Easterly


    Redsunset wrote: »
    well I wouldn't call the flow zonal.

    Meridional flow around the Northern hemisphere looks evident with some exaggerated troughs and ridges.

    Not so sure about that Red, The outlook for the NH looks fairly Zonal overall, if a little more slack than what you would expect for the time of year.
    230686.PNG


  • Closed Accounts Posts: 309 ✭✭Wolfe_IRE


    Redsunset wrote: »
    I understand that but I'm taking the Northern hemisphere as a whole.
    Fair enough. I'm talking about Ireland.


  • Closed Accounts Posts: 2,693 ✭✭✭Redsunset


    Ok agree to disagree. Not raging zonal by any means.


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    Wolfe_IRE wrote: »
    No, I'm not Maq. Why do you presume that?

    No, what I mean was, you were talking about what the model is showing for up to mid-December, not 'this is what the weather will be in mid-December', because nobody knows that. Just look at what the models thought was supposed to happen this weekend. FI is useless apart for entertaining value.


  • Closed Accounts Posts: 4,279 ✭✭✭Su Campu


    Whether it's down to splitting hairs or not, it is more zonal than meridional. The best we look to be getting in the strat is a temporary burglar-mask partial split before it regathers itself in around a week's time. We had a brief flirt with cold, and some higher ground will still get some maybe on Monday night, but to be honest it's just more of the same no matter what model you look at.

    ecmwf30f96.gif


  • Registered Users Posts: 1,985 ✭✭✭BLIZZARD7


    Su Campu wrote: »
    Whether it's down to splitting hairs or not, it is more zonal than meridional. The best we look to be getting in the strat is a temporary burglar-mask partial split before it regathers itself in around a week's time. We had a brief flirt with cold, and some higher ground will still get some maybe on Monday night, but to be honest it's just more of the same no matter what model you look at.

    ecmwf30f96.gif


    Hi Su,


    What are your thoughts on the wave 1 and wave 2 activity that is forecast?

    Also interesting zonal winds at 30hpa and 10hpa are looking like there on the decline.





    Dan :)


  • Moderators, Science, Health & Environment Moderators Posts: 7,146 Mod ✭✭✭✭pistolpetes11


    Could Ireland be in cool Zonal flow and the UK in a Meridional pattern

    Matthew Hugo ‏@MattHugo81
    12Z EC ENS clusters beyond the 10th have a very meridional pattern with high pressure influential in some interesting positions.


  • Advertisement
  • Closed Accounts Posts: 309 ✭✭Wolfe_IRE


    Could Ireland be in cool Zonal flow and the UK in a Meridional pattern

    Matthew Hugo ‏@MattHugo81
    12Z EC ENS clusters beyond the 10th have a very meridional pattern with high pressure influential in some interesting positions.

    That's 12 days time so it could end up that way, Pete. The discussion we had was about the coming 7-10 days.


  • Banned (with Prison Access) Posts: 25,234 ✭✭✭✭Sponge Bob


    And the models have lost their handle on the NAO over the next 7 days. It has just gone a netch positive and is trending higher and faster to there than the models showed on the last few days runs. Lets see if the models 'catch up' with reality over the next 2 runs.


  • Registered Users, Registered Users 2 Posts: 2,855 ✭✭✭Nabber


    The models past 144 are varying so much they might aswell not bother. GFS has a euro high building and blocking off that sub tropical mess from hitting UK and Ireland.


    I can see the models throwing out another round of possible cold over the weekend for next week, but then quickly dropping it. But as always it will be 196+ The hype will begin

    Look at the last run of the GFS, like last years big freeze. Pressure is not as high or as further north. Nice to look at all the same. No use for us tho :)

    12121506_2906.gif


  • Moderators, Science, Health & Environment Moderators Posts: 7,146 Mod ✭✭✭✭pistolpetes11


    Sponge Bob wrote: »
    And the models have lost their handle on the NAO over the next 7 days. It has just gone a netch positive and is trending higher and faster to there than the models showed on the last few days runs. Lets see if the models 'catch up' with reality over the next 2 runs.
    :confused:

    230777.png


  • Registered Users, Registered Users 2 Posts: 14,596 ✭✭✭✭M.T. Cranium


    Just posting a friendly reminder in all winter-related threads that the

    Third Annual Winter Forecast Contest

    is open for entries but late penalties will apply starting Sunday 2nd December.

    This is available in a separate thread on the weather forum. Thanks.

    http://www.boards.ie/vbulletin/showthread.php?t=2056808656

    Note also that the Monthly forecast contest for December is open, with the same deadline, and for 2013 we have added a third form of competition to our existing annual contests, namely seasonal contests which will run from Dec 2012 to Nov 2013 in the four traditional seasons, and this will also produce an annual champion. See the thread for details (which are posted today rather than in the original post).


  • Registered Users Posts: 769 ✭✭✭davidsr20


    Just posting a friendly reminder in all winter-related threads that the

    Third Annual Winter Forecast Contest

    is open for entries but late penalties will apply starting Sunday 2nd December.

    This is available in a separate thread on the weather forum. Thanks.

    http://www.boards.ie/vbulletin/showthread.php?t=2056808656

    Note also that the Monthly forecast contest for December is open, with the same deadline, and for 2013 we have added a third form of competition to our existing annual contests, namely seasonal contests which will run from Dec 2012 to Nov 2013 in the four traditional seasons, and this will also produce an annual champion. See the thread for details (which are posted today rather than in the original post).
    Mt how come u never post in discussion treads it would be nice to see some of ur input on what's ahead!


  • Closed Accounts Posts: 309 ✭✭Wolfe_IRE


    davidsr20 wrote: »
    Mt how come u never post in discussion treads it would be nice to see some of ur input on what's ahead!

    He posts a detailed long range outlook every day.

    Anyway, I would fear for his safety in here. :P


  • Registered Users, Registered Users 2 Posts: 1,789 ✭✭✭BEASTERLY


    Sponge Bob wrote: »
    NAO in positive mode is not conducive to a block on the atlantic flows and does not look like building a block over the next 7-10 days. So I entirely agree with Wolfie on that timescale. Normal service for 7-10 days.

    The NAO is a measurement, not a driver. North Atlantic blocking will result in a negative NAO pattern. The state of the NAO is only an indicator of current conditions.


  • Registered Users, Registered Users 2 Posts: 11,134 ✭✭✭✭maquiladora


    davidsr20 wrote: »
    Mt how come u never post in discussion treads it would be nice to see some of ur input on what's ahead!

    There isn't a whole lot to discuss at the moment. It's looking fairly uninteresting in the short and medium term.


  • Advertisement
  • Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 18,165 Mod ✭✭✭✭DOCARCH


    davidsr20 wrote: »
    Mt how come u never post in discussion treads it would be nice to see some of ur input on what's ahead!

    MT is like the (sensible) parent who minds the coats and bags while the kids are on the rollercoaster! :)

    Usually when MT posts there is the potential of something actually happening.


  • Registered Users, Registered Users 2 Posts: 8,708 ✭✭✭Speak Now


    BEASTERLY wrote: »
    The NAO is a measurement, not a driver. North Atlantic blocking will result in a negative NAO pattern. The state of the NAO is only an indicator of current conditions.

    Do they use the GFS Ensembles to forecast NAO? If so they're as FI as anything else :D


  • Closed Accounts Posts: 5,150 ✭✭✭Deep Easterly


    IMT wise, yesterday's daily mean of 0.6c was the coolest mean temp of 2012 after the -0.3c on 2nd Feb last and equal to that of the 1st Feb. This made yesterday's reading the joint 2nd lowest of 2012 so far.

    Data from met.ie.

    230827.PNG


  • Registered Users Posts: 15 tresb26


    Where can you get MT's forecasts?


  • Registered Users, Registered Users 2 Posts: 1,572 ✭✭✭DominoDub


    tresb26 wrote: »
    Where can you get MT's forecasts?

    Sticky Link at top of forum page

    Your daily forecasts from Boards.ie weather forum (NO CHAT)

    http://www.boards.ie/vbulletin/showthread.php?t=2055579971&page=68


  • Registered Users, Registered Users 2 Posts: 3,169 ✭✭✭Rebelbrowser


    Said MT seems to be hinting at more interesting times ahead in today's bulletin - mention of possible easterly in 10 or so day's time.....


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 24,371 ✭✭✭✭Larbre34


    Said MT seems to be hinting at more interesting times ahead in today's bulletin - mention of possible easterly in 10 or so day's time.....

    Yet, UK Met have backed off in the severity of their monthly outlook (I know it wasnt that severe to begin with) and altered the prevailing wind direction for the period

    UK Outlook for Tuesday 4 Dec 2012 to Thursday 13 Dec 2012:
    Low pressure will probably remain across or close to the British Isles through much of the forecast period. As a result, the weather looks likely to stay rather unsettled and cold during the first half of December. Showers or longer spells of rain will affect many areas with a risk of some heavy rain in places. Snow is probable over high ground, especially in the north, and it may fall to lower levels at times. It will be windy at times with a chance of gales in exposed western and southwestern areas. As the wind will mainly be from the north or northwest, temperatures will be generally rather cold, with some frosty nights likely, although there may be some milder weather in the south for a time.

    UK Outlook for Saturday 15 Dec 2012 to Saturday 29 Dec 2012:
    Temperatures by both day and night are most likely to be below average during this period, with a greater incidence of overnight frost and, at times, fog or freezing fog. The signal for rain and snowfall amounts during this period shows a high degree of uncertainty, however, on balance, slightly drier conditions compared to average are favoured for most of the UK. Even though there is a drier-than-average signal for much of the UK, where precipitation does occur, there is a greater chance that it will fall as snow compared to normal.

    Issued at: 0400 on Fri 30 Nov 2012


  • Closed Accounts Posts: 1,101 ✭✭✭Weathering


    Larbre34 wrote: »
    Yet, UK Met have backed off in the severity of their monthly outlook (I know it wasnt that severe to begin with) and altered the prevailing wind direction for the period

    UK Outlook for Tuesday 4 Dec 2012 to Thursday 13 Dec 2012:
    Low pressure will probably remain across or close to the British Isles through much of the forecast period. As a result, the weather looks likely to stay rather unsettled and cold during the first half of December. Showers or longer spells of rain will affect many areas with a risk of some heavy rain in places. Snow is probable over high ground, especially in the north, and it may fall to lower levels at times. It will be windy at times with a chance of gales in exposed western and southwestern areas. As the wind will mainly be from the north or northwest, temperatures will be generally rather cold, with some frosty nights likely, although there may be some milder weather in the south for a time.

    UK Outlook for Saturday 15 Dec 2012 to Saturday 29 Dec 2012:
    Temperatures by both day and night are most likely to be below average during this period, with a greater incidence of overnight frost and, at times, fog or freezing fog. The signal for rain and snowfall amounts during this period shows a high degree of uncertainty, however, on balance, slightly drier conditions compared to average are favoured for most of the UK. Even though there is a drier-than-average signal for much of the UK, where precipitation does occur, there is a greater chance that it will fall as snow compared to normal.

    Issued at: 0400 on Fri 30 Nov 2012

    Seems pretty good to me as in regards to cold/snow. They have to keep the forecast grounded


  • Registered Users Posts: 1,008 ✭✭✭icesnowfrost


    Seen that in the sun... Surly they can't no this early if it will or won't


  • Registered Users Posts: 1,985 ✭✭✭BLIZZARD7


    FI has being throwing up some interesting scenarios on the last few GFS runs with some very nice eye candy at the end of todays runs- 1947 esque.

    18z GFS at +240hrs-

    a8upa4e5.jpg

    And then todays 06z at the end>

    ygu2usu4.jpg


    AO looks like staying negative-

    ezuhyret.jpg

    NAO a bit more uncertain but looks like going negative-

    a7a8yjuj.jpg

    Decent warming at 30hpa level is forecast-

    5u7y9yma.jpg

    Nice NAEFS mean at +120hrs-

    y4ataja5.jpg

    ECM ensembles are very cold for De Bilt-

    nasaty6a.jpg

    EPV Flux is forecast to direct at the pole, as far as I know this usually causes the polar vortex to self destruct if it is sustained for long enough- it is only a forecast for the minute but is definitley one to watch.

    4emy5a4u.jpg


    Outlook is quite uncertain but Cold and potentially snowy weather is more likely as we reach mid to late December in my opinion.




    Dan :)


  • Closed Accounts Posts: 304 ✭✭Jaffusmaximus


    Very interesting things happening on the models yet very quite here. Has anyone thoughts on the hype about FI showing a considerable cold period ahead and also after all the talk of a more milder set up we are looking at another trip into to low digit temps. The fact still stands that with a PV that has been put through the shredder so nothing can be taken for certain especially another mild December.


  • Advertisement
  • Closed Accounts Posts: 5,362 ✭✭✭Trotter


    I find the charts enthralling but I'm working off my own vague stats when I say I've seen maybe 10 periods in the last 3 years where I thought I'd see snow after following FI charts. In reality, I've seen less than 5 heavy snow falls in my lifetime.

    Based on pure sequencing of snow events, I'm not expecting anything for another 2 to 3 years minimum.


  • Banned (with Prison Access) Posts: 197 ✭✭Eastcoastryan


    Trotter wrote: »
    I find the charts enthralling but I'm working off my own vague stats when I say I've seen maybe 10 periods in the last 3 years where I thought I'd see snow after following FI charts. In reality, I've seen less than 5 heavy snow falls in my lifetime.

    Based on pure sequencing of snow events, I'm not expecting anything for another 2 to 3 years minimum.

    Were 2 of those 5 in the past 3 years?


  • Closed Accounts Posts: 5,362 ✭✭✭Trotter


    Were 2 of those 5 in the past 3 years?

    Im counting Nov 10 and Feb 11 as one period of snowy weather but beyond that I can't really remember more than 4. I might be totally off but Im just saying from memory I don't recall getting snow any more often than maybe once in 4 or 5 years.


  • Banned (with Prison Access) Posts: 197 ✭✭Eastcoastryan


    I'm kind of on the same page as you, I'm just not "feeling" it!

    Would this set up not bring anything Wintry? It's only 4 days out too!!

    http://www.meteociel.fr/modeles/gfse_cartes.php?ech=84&code=0&mode=0


  • Registered Users Posts: 200 ✭✭jimmy.d


    looking at the charts dew point for wed morn down to -2, dam line 524, north winds, -2 temps could be snow for some east coast but -5 uppers lets it down can someone have a look at this only learning more than likely worng


  • Registered Users, Registered Users 2 Posts: 2,682 ✭✭✭Rougies


    jimmy.d wrote: »
    looking at the charts dew point for wed morn down to -2, dam line 524, north winds, -2 temps could be snow for some east coast but -5 uppers lets it down can someone have a look at this only learning more than likely worng

    I presume you mean the 18z GFS charts? If so there nothing really on for the east coast. The wind direction is from the N/NW so any showers would be more likely in the North/NW. And they'd be unlikely to penetrate very far inland.

    For the N/NW snow potential the uppers/dam line/dp are ok but the air temp isn't great and when taking into account the long track of the cold air across the ocean (which warms the lower layers) I'd say wet snow showers/sleet at best and snow on high ground.

    (I'm open for criticism and correction on this!)


  • Registered Users Posts: 200 ✭✭jimmy.d


    Rougies wrote: »

    I presume you mean the 18z GFS charts? If so there nothing really on for the east coast. The wind direction is from the N/NW so any showers would be more likely in the North/NW. And they'd be unlikely to penetrate very far inland.

    For the N/NW snow potential the uppers/dam line/dp are ok but the air temp isn't great and when taking into account the long track of the cold air across the ocean (which warms the lower layers) I'd say wet snow showers/sleet at best and snow on high ground.

    (I'm open for criticism and correction on this!)
    No the 06 z and 09 thanks


  • Registered Users Posts: 2,015 ✭✭✭John.Icy


    Things looking very interesting now for the UK, even as early as Thursday with a potential channel low.

    For Ireland, meh output....nothing to cold, pressure to high mostly, and the really cold uppers refuse to make their way to our shores from the UK.

    All up in the air still anyway, but fingers crossed if cold does come about, we're not left on the outside of it, again.


  • Registered Users Posts: 164 ✭✭Caff Caff


    Models this morning are very poor even in FI. GFs, UKMO, ECMWF... The trend is certainly looking to a chilly or nippy December but nothing that will bring the white stuff to lower ground. There needs to be a radical shift in the next few runs but I still think this change will happen, gradually, as we approach Christmas. It is looking more like late December-eary January for snowy potential to hit the east coast of Ireland but we will have to suffer a few more drab model runs. watch that trend!


  • Registered Users Posts: 1,985 ✭✭✭BLIZZARD7


    Caff Caff wrote: »
    Models this morning are very poor even in FI. GFs, UKMO, ECMWF... The trend is certainly looking to a chilly or nippy December but nothing that will bring the white stuff to lower ground. There needs to be a radical shift in the next few runs but I still think this change will happen, gradually, as we approach Christmas. It is looking more like late December-eary January for snowy potential to hit the east coast of Ireland but we will have to suffer a few more drab model runs. watch that trend!

    Output is brilliant, not very poor. Unless you are looking for mild weather that is.

    THIS is poor-

    sy5amyry.jpg

    mugajaje.jpg

    THIS is most defintley not-

    8ege7u5e.jpg

    We have a split vortex, southerly tracking jet and numerous other factors in our favour, and these are only going to get better with the current strat forecasts. EPV is still meant to be directed poleward at day 7 ish in todays update and this will cause the polar vortex to shred from its current split position. This should increase northern blocking and thus our chances of a very cold pattern.

    UK met are expecting a slightly milder blip before a firmer scandinavian block establishes with an easterly flow over the UK and with fronts attacking from the south or south west- This is from Ian Ferguson.




    Dan :)


  • Advertisement
This discussion has been closed.
Advertisement